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+.\" Copyright (c) 1990, 1991 The Regents of the University of California.
+.\" All rights reserved.
+.\"
+.\" This code is derived from software contributed to Berkeley by
+.\" the Systems Programming Group of the University of Utah Computer
+.\" Science Department.
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\" 3. All advertising materials mentioning features or use of this software
+.\"    must display the following acknowledgement:
+.\"	This product includes software developed by the University of
+.\"	California, Berkeley and its contributors.
+.\" 4. Neither the name of the University nor the names of its contributors
+.\"    may be used to endorse or promote products derived from this software
+.\"    without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\"     from: @(#)dcl.4	5.2 (Berkeley) 3/27/91
+.\"	$Id: dcl.4,v 1.1 1995/10/18 08:44:27 deraadt Exp $
+.\"
+.Dd March 27, 1991
+.Dt DCL 4 hp300
+.Os
+.Sh NAME
+.Nm dcl
+.Nd
+.Tn HP
+98628A communications link
+.Sh SYNOPSIS
+.Cd "device dcl0 at scode? flags 0x1"
+.Sh DESCRIPTION
+The 98628A is a buffered
+.Tn EIA
+.Tn RS-232C
+.Pf ( Tn CCITT
+.Tn V.28 )
+communications interface.
+It has one port with full modem control.
+.Pp
+Input and output for each line may set to one of following baud rates;
+0, 50, 75, 110, 134.5, 150, 200, 300, 600, 1200, 1800, 2400, 4800,
+9600, 19200.
+.Pp
+An optional argument
+.Ar flags
+may be set to 1 if the line should be treated as hard-wired with
+carrier always present, or to 0 if modem control is desired.
+.Pp
+Use
+.Tn HP
+cable "98626 & 98628 opts.002,
+.Tn RS232-C
+.Tn DCE CABLE ,
+5061-4216" to attach non-modem devices.
+Use
+.Tn HP
+cable "98626 & 98628 opts.001,
+.Tn RS232-C
+.Tn DTE CABLE ,
+5061-4215" to attach modems.
+.Pp
+The 98628A has a 256 byte input silo and a 256 output silo. Input interrupts
+happen on a per character basis.
+.Pp
+The high water and low water marks in the kernel tty routines are completely
+inappropriate for a device like this with a large input buffer.  Don't use
+tandem mode if possible.  A fast system can handle input at 19.2K baud without
+receive overflow.
+.Pp
+For output to devices that make heavy use of
+.Tn XON/XOFF
+a write size of less
+then 256 will improve performance marginally.
+.Sh FILES
+.Bl -tag -width /dev/ttyl[0-9] -compact
+.It Pa /dev/ttyl[0-9]
+.El
+.Sh DIAGNOSTICS
+.Bl -diag
+.It dcl%d: error 0x%x RESET CARD.
+Where the errors are encoded:
+.Bd -unfilled -offset indent
+0x06 card failure
+0x0d uart receive overflow
+0x0e receive overflow
+0x0f missing external clock
+0x10 cts false too long
+0x11 lost carrier
+0x12 activity timeout
+0x13 connection not established
+0x19 illegal databits/parity
+0x1a register address out of range
+0x1b register value out of range
+0x-- unknown error
+.Ed
+.El
+.Sh SEE ALSO
+.Xr tty 4
+.Sh HISTORY
+The
+.Nm
+driver
+.Ud
+.Sh BUGS
+Breaks received at a faster rate then 1 break every second will be 
+recognized as a single break.
+.Pp
+Console use is not supported.
+.Pp
+The
+.Tn RS-422/423/499 ,
+.Tn MTS-DSN/DL
+modes of the card are not supported.